28089299 has 10 divisors (see below), whose sum is σ = 32771700. Its totient is φ = 24074484.

The previous prime is 28089241. The next prime is 28089337. The reversal of 28089299 is 99298082.

It is a happy number.

It is not a de Polignac number, because 28089299 - 2²⁰ = 27040723 is a prime.

It is a super-2 number, since 2×28089299² = 1578017436622802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28086299) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3449 + ... + 8250.

It is an arithmetic number, because the mean of its divisors is an integer number (3277170).

Almost surely, 2^28089299 is an apocalyptic number.

28089299 is a deficient number, since it is larger than the sum of its proper divisors (4682401).

28089299 is an frugal number, since it uses more digits than its factorization.

28089299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11727 (or 11706 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 28089299 is about 5299.9338675119. The cubic root of 28089299 is about 303.9813693280.

The spelling of 28089299 in words is "twenty-eight million, eighty-nine thousand, two hundred ninety-nine".